"On Thursday, March 17, 2016, we held an hourlong conversation with Rukmini Callimachi, a foreign correspondent for The Times who covers Islamic extremism and recently wrote about the Islamic State’s use of birth control to maintain its supply of sex slaves. Ms. Callimachi was joined by Liam Stack, a reporter for The Times who spent several years covering the Middle East from Cairo, and Matthew Barber, a University of Chicago Ph.D. student and the Iraq executive director of Yazda, an organization that helps victims of the Islamic State's system of sexual slavery. Matthew contributed from Iraq."